The AM Forum
October 09, 2024, 11:22:53 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: 80 Watt Class D Transmitter by WA7JHZ  (Read 9144 times)
0 Members and 1 Guest are viewing this topic.
Steve - K4HX
Administrator
Member

Offline Offline

Posts: 2733



« on: September 06, 2015, 10:55:10 PM »

From David, WA7JHZ:

Attached is a GIF schematic of my 80-Watt transmitter. Its RF final runs in class-D mode and the overall distortion is about 2.8% THD at 1KHz at 100% modulation. Two of my older designs use an LM566 triangular wave generator and LM311 comparator. The TL494 makes for a simple and cheap PWM stage in my later units.

I would like to see someone improve on this design. My friend, Arne (W7TRO) has run this design at 300-Watts carrier. If a person could select an FET set with good speed and 600-Volt source-drain breakdown, I believe it could provide 375-Watts of continuous carrier.


* 80W 75M PWM AM Xmtr w TL494 and IXDD414CI 6-3-2011 GIF.GIF (18.73 KB, 600x700 - viewed 6012 times.)
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.043 seconds with 18 queries.